connect to the performance task: star life cycles
which star(s) are likely to have a nearby earth - like planet?
1. use a blank circle to record the data for each star in this data set. place them all on the star chart to compare them to our sun.
2. use the star chart to make a claim about the color and the expected life span of each star based on where you placed it on the chart.
3. decide based on the data whether you think it is possible that the star could have a nearby habitable planet.
| star name | luminosity ($l_{sun}$) | temperature (kelvin) | color | expected life span (years) | could this star support a habitable planet? |
|--|--|--|--|--|--|
| kepler - 79 |.93 | 6,174 | | | $square$ yes $square$ maybe $square$ no |
| kepler - 442 |.117 | 4,402 | | | $square$ yes $square$ maybe $square$ no |
| kepler - 432 | 9.21 | 4,995 | | | $square$ yes $square$ maybe $square$ no |
| kepler - 18 | 2.69 | 5,345 | | | $square$ yes $square$ maybe $square$ no |
| eta carinae | 5,000,000 | 40,000 | | | $square$ yes $square$ maybe $square$ no |
| kepler 186 |.055 | 3,755 | | | $square$ yes $square$ maybe $square$ no |
| trappist 1 | 0.0005 | 2,511 | | | $square$ yes $square$ maybe $square$ no |
| hd 20782 | 7.38 | 5,578 | | | $square$ yes $square$ maybe $square$ no |
| hd 17156 | 1.12 | 6,100 | | | $square$ yes $square$ maybe $square$ no |

Question

connect to the performance task: star life cycles
which star(s) are likely to have a nearby earth - like planet?
1. use a blank circle to record the data for each star in this data set. place them all on the star chart to compare them to our sun.
2. use the star chart to make a claim about the color and the expected life span of each star based on where you placed it on the chart.
3. decide based on the data whether you think it is possible that the star could have a nearby habitable planet.
| star name | luminosity ($l_{sun}$) | temperature (kelvin) | color | expected life span (years) | could this star support a habitable planet? |
|--|--|--|--|--|--|
| kepler - 79 |.93 | 6,174 |  |  | $square$ yes $square$ maybe $square$ no |
| kepler - 442 |.117 | 4,402 |  |  | $square$ yes $square$ maybe $square$ no |
| kepler - 432 | 9.21 | 4,995 |  |  | $square$ yes $square$ maybe $square$ no |
| kepler - 18 | 2.69 | 5,345 |  |  | $square$ yes $square$ maybe $square$ no |
| eta carinae | 5,000,000 | 40,000 |  |  | $square$ yes $square$ maybe $square$ no |
| kepler 186 |.055 | 3,755 |  |  | $square$ yes $square$ maybe $square$ no |
| trappist 1 | 0.0005 | 2,511 |  |  | $square$ yes $square$ maybe $square$ no |
| hd 20782 | 7.38 | 5,578 |  |  | $square$ yes $square$ maybe $square$ no |
| hd 17156 | 1.12 | 6,100 |  |  | $square$ yes $square$ maybe $square$ no |

Accepted Answer

# Explanation:
## Step1: Determine star - color relationship
Stars' colors are related to their temperatures. Generally, hotter stars are bluer and cooler stars are redder. For example, blue - white stars are very hot, and red stars are cooler.
## Step2: Estimate life - span based on luminosity
More luminous stars use up their nuclear fuel faster and have shorter life - spans. Less luminous stars have longer life - spans.
## Step3: Evaluate habitability
A star is more likely to support a habitable planet if it has a stable energy output over a long period (long life - span), and its luminosity and temperature allow for a habitable zone where liquid water could exist on a planet's surface.
- Kepler - 79: Luminosity close to the Sun, relatively high temperature. It could potentially have a habitable planet as its characteristics are somewhat similar to the Sun's, so Maybe.
- Kepler - 442: Lower luminosity and temperature. It could have a long life - span and might have a habitable zone, so Maybe.
- Kepler - 432: High luminosity, which means a shorter life - span. It is less likely to support a long - term habitable planet, so No.
- Kepler - 18: Higher luminosity than the Sun, shorter life - span likely, so No.
- Eta Carinae: Extremely high luminosity and temperature, very short life - span, so No.
- Kepler 186: Low luminosity and temperature, long life - span possible, so Maybe.
- Trappist 1: Very low luminosity and temperature, but has known Earth - sized planets in its habitable zone, so Yes.
- HD 20782: High luminosity, shorter life - span, so No.
- HD 17156: Luminosity and temperature similar to the Sun in some respects, so Maybe.

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QUESTION IMAGE

Question

Explanation:

Step1: Determine star - color relationship

Step2: Estimate life - span based on luminosity

Step3: Evaluate habitability

Answer:

star name	luminosity ($l_{sun}$)	temperature (kelvin)	could this star support a habitable planet?
kepler - 442	.117	4,402	$square$ yes $square$ maybe $square$ no
kepler - 432	9.21	4,995	$square$ yes $square$ maybe $square$ no
kepler - 18	2.69	5,345	$square$ yes $square$ maybe $square$ no
eta carinae	5,000,000	40,000	$square$ yes $square$ maybe $square$ no
kepler 186	.055	3,755	$square$ yes $square$ maybe $square$ no
trappist 1	0.0005	2,511	$square$ yes $square$ maybe $square$ no
hd 20782	7.38	5,578	$square$ yes $square$ maybe $square$ no
hd 17156	1.12	6,100	$square$ yes $square$ maybe $square$ no

Star Name	Color	Expected Life Span (years)	Could this star support a habitable planet?
Kepler - 442	Red (due to low temperature)	Long	Maybe
Kepler - 432	Red (despite high luminosity, temperature is not extremely high for blue - white)	Short	No
Kepler - 18	Blue - white	Short	No
Eta Carinae	Blue - white	Very short	No
Kepler 186	Red	Long	Maybe
Trappist 1	Red	Long	Yes
HD 20782	Blue - white	Short	No
HD 17156	Blue - white	Medium	Maybe